A hand-held surgical instrument designed for insertion into a blood vessel (the vasculature) to unblock, enlarge or measure the internal diameter of the vessel during a surgical intervention. It is a rod-like device with a long, slender, body that terminates with a bulbous, cylindrical distal tip of various shapes and sizes. Commonly known as a vessel dilator or vascular probe, it is available in a variety of sizes (diameters and lengths) and flexibilities. It is typically made of metal or plastic materials. This is a reusable device.